Optical band gaps and spectroscopy properties of Bi^m+/Euⁿ⁺/Yb³⁺ co-doped (m = 0, 2, 3; and n = 2, 3) zinc calcium silicate glasses

Abstract

VIS emission spectra of SZC-xBi0.6Eu2Yb (x = 1.0, 1.2, 1.4, 1.6, and 1.8 mol%) zinc calcium silicate glass samples under 320 nm excitation.

The effect of MnCO3 on the gain coefficient for the 4I13/2 → 4I15/2 transition of Er3+ ions and near-infrared emission bandwidth flatness of Er3+/Tm3+/Yb3+ co-doped barium zinc silicate glasses

“…The obtained results of the EDS spectrum analysis of the SZB-0.5Er1Tm2Yb2Mn glass sample conrmed that the C, Ti, O, Ba, Zn, Si, Mn, Tm, Er, and Yb elements were still present in the SiO 2 -ZnO-BaO-TiO 2 -Er 2 O 3 -Tm 2 O 3 -MnCO 3 -Yb 2 O 3 glass matrix. 27,28 It should be noted that the Mn element has many different valence states, including +2, +3, +4, +5, +6, and +7 valences. When the MnCO 3 compound is introduced into the host glasses, the Mn element exists almost exclusively in the Mn 2p1 and Mn 2p3 valence states and this was investigated through XPS analysis and reported in a previous study.…”

“…Curve (a) shows the optical transmittance spectra of the Er 3+ -doped sample in which seven optical transmittance bands can be observed corresponding to the 4 I 15/2 / 4 G 11/2 , -4 F 7/2 , -2 H 11/2 , -4 S 3/2 , -4 F 9/2 , -4 I 11/2 and -4 I 13/2 transitions of Er 3+ ions. 29,30 Curve (b) shows the optical transmittance spectrum of the Er 3+ /Yb 3+ / Mn 2+ -co-doped sample in which nine optical transmittance bands can be observed, among which, one corresponds to the 6 A 1g / 4 T 1g transition of Mn 2+ ions, 13,14,17 one corresponds to the 2 F 7/2 / 2 F 5/2 transition of Yb 3+ ions, 27,28 and the remaining seven correspond to the 4 I 15/2 / 4 G 11/2 , -4 F 7/2 , -2 H 11/2 , -4 S 3/2 , -4 F 9/ 2 , -4 I 11/2 and -4 I 13/2 transitions of Er 3+ ions. 30,31 Curve (c) shows the optical transmittance spectra of the Tm 3+ -doped in SZB-1Tm glass sample in which ve optical transmittance bands can be observed corresponding to the 3 H 6 / 1 G 4 , -3 F 2,3 , -3 H 4 , -3 H 5 , and -3 F 4 transitions of Tm 3+ ions.…”

“…30,31 Curve (c) shows the optical transmittance spectra of the Tm 3+ -doped in SZB-1Tm glass sample in which ve optical transmittance bands can be observed corresponding to the 3 H 6 / 1 G 4 , -3 F 2,3 , -3 H 4 , -3 H 5 , and -3 F 4 transitions of Tm 3+ ions. Curve (d) shows the optical transmittance spectra of the Tm 3+ /Yb 3+ /Mn 2+ co-doped in SZB-1Tm2Yb2Mn glass sample in which seven optical transmittance bands can be observed, among which, one corresponds to the 6 A 1g / 4 T 1g transition of Mn 2+ ions, 13,14,17 one corresponds to the 2 F 7/2 / 2 F 5/2 transition of Yb 3+ ions, 27,28,31 and the remaining ve optical transmittance bands correspond to the 3 H 6 / 1 G 4 , -3 F 2,3 , -3 H 4 , -3 H 5 , and -3 F 4 transitions of Tm 3+ ions. 27,28 To more clearly observe the optical transmittance spectra of Er 3+ , Mn 2+ , and Yb 3+ ions, we measured and further analyzed the optical transmittance spectra of the SZB-2Mn2Yb, SZB-0.5Er1Tm2Yb, and SZB-0.5Er1Tm2Yb2Mn glass samples.…”